Amy, the devs can mess around with the declining quests all they like. But they are constantly overlooking one important thing:
For anyone who plays this game very actively, workshops do not provide enough supplies. Before anyone tells me to balance my city, I have a dozen level 17 workshops. The supply shortage means we end up having to constantly cycle quests, even though doing so is very tedious.
It would be much more enjoyable if workshops gave more supplies, and the quests instead gave random rewards that weren't crucial to being able to play at all, but small pleasant surprises. Supplies, coins, small amounts of goods, a very low chance of a few diamonds, a rune shard here or there.